See, but this is exactly the problem. If I ask you who wins in a fight, The Punisher or Lobo... the answer is obvious. Lobo wins. The guy can laugh in the face of missiles being fired at him, and get away with only some mussed hair. And, when the adventure gets to a high enough level, both Lobo and Punisher are facing gods. Lobo... can fight at that level. Frank Castle... can't.
But you want them both to be represented by the same class at the same level.
See, but over half of what you want the wizard player to know is already true. Dispel Magic ONLY works on SPELLS. You can't dispel magic on a magic item, it doesn't work, per how the spell is phrased. So, unless your wizard player thinks Lobo has an active spell effect on him, he won't expect Dispel Magic to work.
And, at least for me, I wouldn't expect Anti-Magic to work either. I wouldn't expect it to weaken a death knight, or a storm giant, or or really any non-caster. So, the only confusion I can see, is if the player thought his strength came from a magical object. But, again.... why would he? You don't see a Pit Fiend and think of using Anti-magic on it to take away its strength, because that just doesn't make sense.